export function isAdmin(){
    const userId = sessionStorage.getItem('userId');
    if(!userId) return false;
    if(userId === '1') {
        return true ;
    } else {
        return false;
    }
}

export function getUserInfo(){
    let userinfo = sessionStorage.getItem('yct_userinfo');
    if(!userinfo) return null;
    userinfo = JSON.parse(userinfo);
    return userinfo;
}

 
export function IEVersion() {
    var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串  
    var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1; //判断是否IE<11浏览器  
    var isEdge = userAgent.indexOf("Edge") > -1 && !isIE; //判断是否IE的Edge浏览器  
    var isIE11 = userAgent.indexOf('Trident') > -1 && userAgent.indexOf("rv:11.0") > -1;
    if (isIE) {
        var reIE = new RegExp("MSIE (\\d+\\.\\d+);");
        reIE.test(userAgent);
        var fIEVersion = parseFloat(RegExp["$1"]);
        if (fIEVersion == 7) {
            return 7;
        } else if (fIEVersion == 8) {
            return 8;
        } else if (fIEVersion == 9) {
            return 9;
        } else if (fIEVersion == 10) {
            return 10;
        } else {
            return 6;//IE版本<=7
        }
    } else if (isEdge) {
        return false;//edge
    } else if (isIE11) {
        return 11; //IE11  
    } else {
        return false;//不是ie浏览器
    }
}
